package com.LeeCode;

/**
 * 合并二叉树
 */

public class Code617 {
    public static void main(String[] args) {

    }

    public TreeNode mergeTrees(TreeNode root1, TreeNode root2) {
        if (root1 == null && root2 == null) return null;
        if (root1 == null) return root2;
        if (root2 == null) return root1;
        root1.val += root2.val;
        root1.left = mergeTrees(root1.left, root2.left);
        root1.right = mergeTrees(root1.right, root2.right);
        return root1;
    }
}
